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Seawater and coral sand mixed red mud-coal gangue based geopolymer concrete and preparation method thereof

A technology of coral sand and coal gangue, applied in the direction of cement production, etc., to achieve the effect of improving cementation behavior, wide application range and wide source

Inactive Publication Date: 2021-03-26
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the embodiment of the present invention is to provide seawater and coral sand mixed red mud-coal gangue base polymer concrete and its preparation method, to solve the two major solid waste recycling problems, and without adding other highly active activators The geopolymer is prepared under the following conditions, and coral sand is used as fine aggregate at the same time, which provides a new green environmental protection material for the construction of islands and reefs

Method used

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  • Seawater and coral sand mixed red mud-coal gangue based geopolymer concrete and preparation method thereof
  • Seawater and coral sand mixed red mud-coal gangue based geopolymer concrete and preparation method thereof
  • Seawater and coral sand mixed red mud-coal gangue based geopolymer concrete and preparation method thereof

Examples

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preparation example Construction

[0043] The concrete preparation steps are as follows:

[0044] Step 1: prepare artificial seawater according to ASTMD1141-2003 standard,

[0045] The proportion of artificial seawater according to the mass ratio is:

[0046] NaCl:Na 2 SO 4 :MgCl 6 h 2 O:KCl:CaCl 2 =24.5:4.1:11.1:0.7:1.2.

[0047] Step 2: Coral sand screened out fine sand, particle size 0.25-0.35mm; gravel is graded gravel, 30% of all gravel mass is between 5-10mm, 70% of all gravel mass is between 10-20mm between.

[0048] Step 3: Break the large pieces of coal gangue into small stones with a particle size of 2-4mm, and then pulverize them.

[0049] Step 4: Air-dry the red mud slurry or dry it at 90-100° C. until the water content is lower than 3%, measure its pH value, and then pulverize it. The main purpose of measuring the pH value is to discuss the influence of the alkalinity of the red mud on the reaction and product of the whole geopolymer; generally speaking, the alkalinity of the red mud is wi...

Embodiment 1-4

[0071] Step 1: Prepare artificial seawater according to mass ratio:

[0072] NaCl:Na 2 SO 4 :MgCl 6 h 2 O:KCl:CaCl 2 =24.5:4.1:11.1:0.7:1.2;

[0073] Step 2: Coral sand screened out fine sand, particle size 0.25-0.35mm; gravel is graded gravel, 30% of all gravel mass is between 5-10mm, 70% of all gravel mass is between 10-20mm between;

[0074] Step 3: breaking the large pieces of coal gangue into small stones with a particle size of 2-4mm, and then pulverizing them;

[0075] Step 4: Air-dry the red mud slurry or dry it at 90-100°C until the moisture content is lower than 3%, and its pH value is measured to be 9-11, and then crush it;

[0076] Step 5: Make red mud-coal gangue mixed raw materials; the mass ratio of the two is 1:2.3-2.3:1, add 20%-30% deionized water, knead into a ball with a diameter of 2-3cm, put Dry it in an oven at 90-100°C to remove its free water, then put it in a muffle furnace for calcination at 600-750°C for 2 hours, take it out and cool it, put...

Embodiment 2

[0088] Example 2, step 5 is to put it in an oven to dry at 90°C to remove its free water, and then put it into a muffle furnace for calcination at 600°C for 2h; step 6 is to mix solid sodium hydroxide with ordinary water to make 5mol / l The sodium hydroxide solution; Step 7 is that the water glass modulus is allocated to 1.6 by sodium hydroxide solution.

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Abstract

The invention discloses seawater and coral sand mixed red mud-coal gangue based geopolymer concrete. The concrete comprises red mud, coal gangue, coral sand, gravel, a sodium hydroxide solution, a water glass solution, artificial seawater and a water reducing agent. The preparation method comprises the following steps: preparing artificial seawater; screening out fine sand from the coral sand; knocking large coal gangue blocks into small coal gangue blocks, and crushing the small coal gangue blocks; air-drying or drying the red mud slurry until the water content is lower than 3%, measuring thepH value of the red mud slurry, and then crushing the red mud slurry; preparing a red mud-coal gangue mixed raw material; preparing a sodium hydroxide solution; lowering the mold of the water glass through a sodium hydroxide solution; mixing the sodium hydroxide solution with the water glass solution subjected to mold reduction to form an alkaline activator; designing the total proportion of thematerials; and preparing all the prepared raw materials into a finished product. The prepared concrete is high in compressive strength and slump, low in cost and wide in application range, recycling of two large solid wastes is achieved, and a new building material source is provided for island and reef construction.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of bulk waste and green building materials, and in particular relates to a polymer concrete with seawater and coral sand mixed red mud-coal gangue base and a preparation method thereof. Background technique [0002] With the development of the aluminum industry, the amount of red mud is increasing day by day. The accumulated red mud not only takes up a lot of farmland, but also seriously pollutes the surrounding environment. Coal gangue is waste rock that is separated during coal mining and washing. With the emergence of geopolymer cementitious materials, great progress has been made in the comprehensive utilization of industrial waste. [0003] The cement hydration product of existing cement-based coral concrete is C-S-H gel, Ca(OH) 2 and AFt, while the South my country Sea is located in the tropical climate zone, the marine environment is complex, and there are differences in the chem...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B111/24
CPCC04B28/006C04B2111/24C04B2201/50C04B18/0409C04B18/12C04B14/28C04B14/02C04B22/062C04B12/04C04B2103/302C04B22/0026Y02P40/10
Inventor 龙志林匡凤兰
Owner XIANGTAN UNIV
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